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Showing content from http://cloud.google.com/appengine/docs/standard/python3/configuring-your-app-with-app-yaml below:

Defining runtime settings | Google App Engine standard environment docs

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An App Engine app is configured using an app.yaml file, that contains the runtime, handlers, scaling, and other general settings including environment variables.

You can specify the runtime configuration for your Python 3 app, including versions and URLs, in the

file. This file acts as a deployment descriptor of a specific

version.

You must first create the app.yaml file for the default service of your app before you can create and deploy app.yaml files for additional services.

Generally, your app.yaml file requires only the runtime element for a simple Python 3 app in the standard environment, for example:

runtime: python313

App Engine provides default values for all other settings, including the F1 instance class, which determines the memory and CPU resources that are available to your app, and automatic scaling, which controls how and when new instances of your app are created.

If you need to override the default settings, create an app.yaml file and specify the settings you need. For more information, see app.yaml file reference.

You can specify a unique name for your app.yaml files, but then you must specify the file name with the deployment command as well. For example, if you name your app.yaml file service-name-app.yaml or app.standard.yaml, then you must deploy your app using either:

gcloud app deploy service-name-app.yaml
gcloud app deploy app.standard.yaml

To learn more about structuring multiple services and

files in your app, see

.

For a complete list of all the supported elements in this configuration file, see the app.yaml reference.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["An `app.yaml` file is used to configure an App Engine app, including its runtime, handlers, scaling, and environment variables."],["For a basic Python 3 app in the standard environment, only the `runtime` element is required in the `app.yaml` file."],["App Engine provides default settings, such as the F1 instance class and automatic scaling, which can be overridden by specifying custom settings in `app.yaml`."],["While you can choose a unique name for your `app.yaml` files, doing so means that you will have to specify the file name with the deployment command, such as `gcloud app deploy service-name-app.yaml`."],["Before you can deploy other services, you must first create an `app.yaml` file for your app's `default` service."]]],[]]

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